1. Global observability for nonlinear autonomous differential equations;Aeyels,1978
2. Generic observability of differentiable systems;Aeyels;SIAM J. Control and Optimization,1981
3. Global observability of Morse-Smale vector fields;Aeyels;J. Diff. Equ,1982
4. Detecting differences between delay vector distributions;Diks;Phys. Rev,1996
5. A new approach to linear filtering and prediction problems;Kalman;Trans. ASME, J. Basic Eng,1960